Systems, devices and methods for communicating data over circularly pulse-shaped waveforms

Patent metadata

Field	Value
Publication number	US-2017331663-A1
Application number	US-201715593691-A
Country	US
Kind code	A1
Filing date	May 12, 2017
Priority date	May 13, 2016
Publication date	Nov 16, 2017
Grant date	—

Abstract

Circularly pulse-shaped waveforms for communication systems are disclosed herein including a single carrier modulation in which pulse-shaping is performed using a circular convolution by the transmitter for various modulation schemes. A transmitter, related method, and corresponding receiver are also disclosed for demodulation of the single carrier circularly pulse-shaped signal and data extraction.

First claim

What is claimed is:

1 . A transmitting device, comprising:
a transmitter including a processor and communication elements, the transmitter configured to:
generate an output signal exhibiting a circularly pulse-shaped waveform constructed by using a circular convolution for pulse shaping during synthesis of an input data signal;
reduce peak-to-average-power-ratio (PAPR) of the output signal responsive to performing single carrier modulation of the input data signal using a pulse shaping filter in the frequency domain; and
transmit the output signal to a receiving device as a single carrier modulated circularly pulse-shaped waveform.

2 . The transmitting device of claim 1 , wherein the output signal is a multiple-input multiple-output (MIMO) signal.

3 . The transmitting device of claim 1 , wherein the transmitter is configured to modulate data symbols for the single carrier modulation waveform using QAM modulation.

4 . The transmitting device of claim 1 , wherein the transmitter is configured to modulate data symbols for the single carrier modulation waveform using OQAM modulation.

5 . The transmitting device of claim 1 , wherein the input data signal includes a vector of data symbols in the time domain.

6 . The transmitting device of claim 1 , wherein the output signal includes at least one data packet including a block of MN samples, wherein M is a number of data blocks and N is a number of samples within each data block, and wherein M and N are integers greater than one.

7 . The transmitting device of claim 6 , wherein the at least one data packet further includes a single cyclic prefix that serves the block of MN samples.

8 . The transmitting device of claim 1 , wherein the circularly pulse-shaped waveform includes a summation of complex-valued sinusoidal tones.

9 . The transmitting device of claim 1 , further comprising an electronic device incorporating the transmitter.

10 . A method of generating a block of circularly pulse-shaped waveforms, the method comprising:
receiving a string of data symbols with a processor of a transmitter; spreading the string of data symbols across a number of tones in the frequency domain with the processor; summing the tones with the processor; circularly shifting and accumulating a result of the summing with the processor; generating an output signal with the processor by serializing a result of the circularly shifting and accumulating; and transmitting the output signal wirelessly via communication elements of the transmitter to a receiving device.

11 . The method of claim 10 , wherein spreading the string of data symbols across a number of tones includes:
applying an L-point fast Fourier transform (FFT) operation that is repeated K times to generate a vector in the frequency domain; and applying a pulse-shaping filter to the vector in the frequency domain at a frequency band of interest.

12 . The method of claim 10 , wherein summing the tones includes passing the tones with the string of data symbols through an inverse fast Fourier transform (IFFT).

13 . The method of claim 10 , further comprising adding a cyclic prefix to the result of the circularly shifting and accumulating.

14 . The method of claim 11 , wherein the pulse-shaping filter h f [k] is a band-limited filter for the frequency band of interest.

15 . The method of claim 14 , wherein the pulse-shaping filter h f [k] satisfies the following constraint 1−ε 1 ≦h f [k]≦1+ε 1 , for 0≦k≦L 1 wherein ε 1 is a design parameter of the transmitter, and L 1 is a number of frequency domain samples for the pulse-shaping filter h f [k].

16 . The method of claim 15 , wherein the pulse-shaping filter in the time domain is defined as:

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17 . The method of claim 11 , wherein the pulse-shaping filter is a band pass filter centered at a predetermined subcarrier band.

18 . A receiving device for processing a data signal exhibiting a single carrier modulation waveform, the receiving device comprising:
a receiver including a process and communication elements, the receiver configured to:
receive a data signal having single carrier modulated circularly pulse-shaped waveform; and
generate estimates of data symbols s 0 through s L-1 that are spread across a number of tones responsive to performing a reverse signal synthesis to the data signal via a fast Fourier transform (FFT) demodulator block of the receiver.

19 . The receiving device of claim 18 , wherein the receiver is further configured to perform interpolation among multi-tones associated with the data signal having the single carrier modulated circularly pulse-shaped waveform to compensate for carrier frequency offset (CFO) of the FFT demodulator block of the re

Assignees

• Battelle Energy Alliance Llc

Inventors

• Moradi Hussein
• Farhang Behrouz

Classifications

• H04L27/3494 Primary

  using non - square modulating pulses, e.g. using raised cosine pulses; Partial response QAM, i.e. with partial response pulse shaping (QAM over partial response channels H04L25/497) · CPC title

• H04B7/0413

  MIMO systems · CPC title

• H04L27/2614

  Peak power aspects · CPC title

• H04L27/2628

  Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators (H04L27/2634 takes precedence) · CPC title

• H04L27/265

  Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators (H04L27/26524 takes precedence) · CPC title